Cardiac Resynchronization Therapy Pacing Interruption: From Early Challenges to Cutting-Edge Solutions

Area of Science:

• Cardiology
• Biomedical Engineering

Background:

• Cardiac resynchronization therapy (CRT) pacing interruptions pose a challenge in heart failure (HF) management.
• Left ventricular (LV) sensing (LVs) can help avoid pacing during vulnerable periods, but interruptions may still occur, sometimes unnoticed.
• LV sensing can paradoxically lead to device-induced ventricular tachycardia (VT).

Purpose of the Study:

• To identify and categorize the causes of CRT pacing interruptions.
• To understand the clinical implications of these interruptions, with or without LVs.
• To explore how advancements in CRT algorithms can mitigate interruptions and improve outcomes.

Main Methods:

• Review of all documented CRT pacing interruption episodes.
• Categorization of interruption causes.
• Analysis of the role of LVs in identifying interruptions.
• Consideration of recent advancements in CRT algorithms.

Main Results:

• Precise causes of CRT pacing interruptions were identified through careful review.
• Interruptions can occur even in devices without LVs.
• Advancements in CRT algorithms show potential to reduce interruptions and enhance device performance.

Conclusions:

• Left ventricular sensing (LVs) aids in identifying pacing interruptions but has limitations.
• CRT interruptions can occur without LVs, and algorithm adjustments can improve device effectiveness.
• Analysis of interruption episodes offers insights for future strategies to achieve uninterrupted CRT pacing.